#include "head.hpp"
#include <iostream>

int main()
{
    int a = 20, b = 10;
    std::cout << " a+b = " << add(a, b) << std::endl;
    std::cout << " a-b = " << substract(a, b) << std::endl;
    std::cout << " a/b = " << divide(a, b) << std::endl;
    std::cout << " a*b = " << multiply(a, b) << std::endl;

    return 0;
}